【摘要】 综合高频编码的码率取决于图中有效边沿的含量。本文给出了四幅测试图片的边沿统计数据,介绍了利用视觉掩盖现象删除无关边沿的方法。从主观试验结果看,自然测试图片和RMA测试卡可以编成码率3.25～3.3bit/pel,而质量和8bit/pel PCM原图仿佛。因此,当要求电视信号能编成码率34Mbit/s时,综合高频是PAL电视亮度信号一种可能的编码方法。用于考核演播室设备质量的菲利浦分辨率测试卡,因为边沿含量高,按上述码率编码时不能获得满意的图象质量。更多还原

【Abstract】 The bit rate of synthetic high coding is determined by the content of relevant edge of a picture. In this paper, the edge statistics of four test pictures are given, the masking effect is used to delete nonrelevant edges. From the result of subjective test, the natural test pictures and BMA test chart can be coded at a rate of 3.25-3.3 bit/pel, which have the same quality as 8 bit/pel PCM Picture, Hence synthetic high coding is a possible method of coding of luminance signal that meets the requirement to encode PAL TV signal into the bit rate of third PCM-hierarchy. The Philip resolution chart, which is used to examine quality of studio facilities, can not be coded at low bit rate with a good quality be-cause of the high edge content.更多还原